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author | Steve French <sfrench@us.ibm.com> | 2007-11-05 14:38:08 +0000 |
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committer | Steve French <sfrench@us.ibm.com> | 2007-11-05 14:38:08 +0000 |
commit | f1d662a7d5e5322e583aad6b3cfec03d8f27b435 (patch) | |
tree | 763e5feccec6636fcce282f7bfdf0ead414e85e6 /fs/cifs/cifs_spnego.c | |
parent | e545937a51fe0cc78cea55752764daabb81ec96d (diff) | |
download | linux-f1d662a7d5e5322e583aad6b3cfec03d8f27b435.tar.gz linux-f1d662a7d5e5322e583aad6b3cfec03d8f27b435.tar.bz2 linux-f1d662a7d5e5322e583aad6b3cfec03d8f27b435.zip |
[CIFS] Add upcall files for cifs to use spnego/kerberos
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifs_spnego.c')
-rw-r--r-- | fs/cifs/cifs_spnego.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c new file mode 100644 index 000000000000..e142faf2d0ae --- /dev/null +++ b/fs/cifs/cifs_spnego.c @@ -0,0 +1,124 @@ +/* + * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS + * + * Copyright (c) 2007 Red Hat, Inc. + * Author(s): Jeff Layton (jlayton@redhat.com) + * + * This library is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published + * by the Free Software Foundation; either version 2.1 of the License, or + * (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/list.h> +#include <linux/string.h> +#include <keys/user-type.h> +#include <linux/key-type.h> +#include "cifsglob.h" +#include "cifs_spnego.h" +#include "cifs_debug.h" + +/* create a new cifs key */ +static int +cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen) +{ + char *payload; + int ret; + + ret = -ENOMEM; + payload = kmalloc(datalen, GFP_KERNEL); + if (!payload) + goto error; + + /* attach the data */ + memcpy(payload, data, datalen); + rcu_assign_pointer(key->payload.data, payload); + ret = 0; + +error: + return ret; +} + +static void +cifs_spnego_key_destroy(struct key *key) +{ + kfree(key->payload.data); +} + + +/* + * keytype for CIFS spnego keys + */ +struct key_type cifs_spnego_key_type = { + .name = "cifs.spnego", + .instantiate = cifs_spnego_key_instantiate, + .match = user_match, + .destroy = cifs_spnego_key_destroy, + .describe = user_describe, +}; + +/* get a key struct with a SPNEGO security blob, suitable for session setup */ +struct key * +cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname) +{ + struct TCP_Server_Info *server = sesInfo->server; + char *description, *dp; + size_t desc_len; + struct key *spnego_key; + + + /* version + ;ip{4|6}= + address + ;host=hostname + ;sec= + NULL */ + desc_len = 2 + 5 + 32 + 1 + 5 + strlen(hostname) + + strlen(";sec=krb5") + 1; + spnego_key = ERR_PTR(-ENOMEM); + description = kzalloc(desc_len, GFP_KERNEL); + if (description == NULL) + goto out; + + dp = description; + /* start with version and hostname portion of UNC string */ + spnego_key = ERR_PTR(-EINVAL); + sprintf(dp, "%2.2x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION, + hostname); + dp = description + strlen(description); + + /* add the server address */ + if (server->addr.sockAddr.sin_family == AF_INET) + sprintf(dp, "ip4=" NIPQUAD_FMT, + NIPQUAD(server->addr.sockAddr.sin_addr)); + else if (server->addr.sockAddr.sin_family == AF_INET6) + sprintf(dp, "ip6=" NIP6_SEQFMT, + NIP6(server->addr.sockAddr6.sin6_addr)); + else + goto out; + + dp = description + strlen(description); + + /* for now, only sec=krb5 is valid */ + if (server->secType == Kerberos) + sprintf(dp, ";sec=krb5"); + else + goto out; + + cFYI(1, ("key description = %s", description)); + spnego_key = request_key(&cifs_spnego_key_type, description, ""); + + if (cifsFYI && !IS_ERR(spnego_key)) { + struct cifs_spnego_msg *msg = spnego_key->payload.data; + cifs_dump_mem("SPNEGO reply blob:", msg->data, + msg->secblob_len + msg->sesskey_len); + } + +out: + kfree(description); + return spnego_key; +} |